“…Transport phenomena in porous media is the subject of prime importance due to its use in latest engineering and scientific applications (Ejlali et al, 2009a, b;Dawes et al, 2009;Zhao et al, 2009;Hassanzadeh et al, 2009;Wang et al, 2008;Hooman et al, , 2009Nazridoust and Ahmadi, 2007;Das and Lewis, 2007;Bhattacharyya et al, 2006;Li et al, 2006;Smit et al, 2005;Das et al, 2003;Rahman and Badr, 2002;Al-Nimr and Hader, 1999). In particular, natural convection in porous media is an important phenomena and a comprehensive review of this phenomena can be found in literature (Kaviany, 1995;Nield and Bejan, 1999;Vafai, 2000;Pop and Ingham, 2001;Bejan and Kraus, 2003;Ingham et al, 2004;Bejan et al, 2004;Ingham and Pop, 2005).…”